Air-injector for furnaces



(No Model.)

HUTGHINSON.

A-IR INJECTOR FOR FURNACES.

' Patented Nov. 13, 1337.

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WILLIAM S. HUTCHINSON, OF CHICAGO, ILLINOIS.

"AIR-INJECTOR FOR FURNACES.

SPECIFICATION iorm lngpart' of Letters Patent 0. 373,139, dated November15, 1887,

To all whom itmay concern.

Be it known that 1, WILLIAM S. HUTOHIN- SON, a citizen of the UnitedStates, residing at Ohicago,in the county of Cook and State of Illinois,have invented certain new and useful Improvements in Air-Injectors forFurnaces, which are fully set forth in the following specification.

My invention relates to devices for increasing :0 the draft offurnaces,"supplying them with air, and aiding the combustionordecomposition of the gas or smoke which arises from them; The objects ofmy invention are to decrease the noise caused by the air and steam, andto provideacombined T and steam-supply nozzle. I accomplish theseobjects by the means illustrated in the accompanying drawings, where-111- Figure l is a side view of a locomotive-boiler with my inventionattached and parts broken away. Fig. 2 is an end view of same. Fig. 3 isa sectional view of a steam-nozzle, airglobe, and connecting parts. 7

Like parts are indicated by the same letter throughout the drawings.

A is a boiler,- B, the steam-dome; O, the smoke-stack; D, the furnace;E, an ash-pan; F, asteam-pipe leading from the steam-dome along the headof the boiler, thence forwardly 0 along the boiler, and terminating in asteamnozzle which discharges into the base of the smoke-stack. H is avalve which controls this 1pc. p J J are transverse pipes along thefront and 5 rear of the furnace, formed by short sections and the Ts, K,from which project the steamnozzles L. x M is ajet-tip,of non-corrosivemetal, screwthreaded into or otherwise attached to the noz- 0 zle L. Ois a shoulder on the inside of the tip, and P shoulders on the interiorof the nozzle, whereby the passage-way of the nozzle and tip graduallyincreases from the T to the discharge end, as shown in Fig. 3, where itwill be seen 5 that,by reason of these shoulders or offsets of theinterior of the jet, the same is successively diminished in size fromleft to right.

It is an air-globe having the apertures S about its side and beingscrew-threaded on the nozzle at T by aright-hand thread,andscrew-threaded on the nippleV by aloft-hand screw-thread, U.

W is a cushion about the mouth of the airpipe X, which leads from theglobe B. This cushion is composed of any kind of sounddeadening or nonconducting substance, as lead. The nipple Vpasses through the flue Y andopens into the furnace. The flue Y is protected from cold-air drafts bythe collar Z, which covers its ends. The flue, being thus protected fromsudden and excessive changes of temperature,is comparatively free fromthe danger of being loosened.

My invention operates after the manner of an air-injector. The area ofthe dischargenozzle is about one-tenth of an inch, and the area of theair-pipe about the dischargetip is aboutone and one-fourth of an inch,and by this arrangement I discharge into the furnace, through eachair-globe and'air-pipe, about two hundred times as much air as the steamdischarged through the steam-nozzle and tip.

Theuse and operation of my invention areas follows:

I have shown my invention as applied to a locomotive furnace'and boiler,though it may .be applied to various uses. The steam-pipe leads from'thesteaindome down along the head of the boiler. At a proper point it sendsoff abranch pipe to supply the upper row of rear airinjectors, and thispipe also proceeds down to supply the air-injectors which open into theash-pan. The steam-pipe then proceeds forward until it sends off anotherbranch pipe to supply the front air-injectors. The steampipe continuesits course until it reaches the interior of the smoke-stack, where itterminates in a jet which assists the draft.

The air-injectors are arranged in rows along the sides of the furnace,and each is constructed as shown. The steam passing out through thesteam-jet tip, having the interior structure as shown, has the greatestpossible power of supplying air. The air is drawn in through theapertures in the side of the air-globe, and the sound usually made by itis greatly decreased or nearly deadened by the cushion in the interiorofthe globe. About the mouth of the airpipe, which leads from theair-globe and into which the steam-nozzle discharges, is placed thiscushion or non-conductor of sound. Many different substances could beused. I have found lead to work very well. This cushion receives thecurrent of air and deadens the sound which it makes when passing overthe unprotected surface of the air-pipe. The shape of this cushion alsofacilitates the supplying of the air. When the supply of steam is outOK, a certain quantity of steam, water, or moisture is left in thesteam-tip, and corrosion would follow were it not for the non-corrosivematerial used. The threads on the ends of the airglobes are the oneright and the other left, so that one globe can be inserted or removedwithout disturbing the remainder. The Ts are cast with the nozzlesprojecting or formed continuous therewith. The steam discharged throughthe various tips operates, in the man near of an injector,to inject alarge quantity/of air into the furnace through the globe and the pipeinto which the tip projects. This latter pipe in the illustration passesthrough a fine, which in turn passes through the waterspace about thefurnace, and lhe globe and T extend outwardly from the end thereof. Thecollar about the globe covers up the connection between the globe andthe fine. thus excluding air from the flue. Any quantity of steam can bedischarged through these nozzles, and the discharge thereof draws largequantities of air into the furnace to assist the draft. consume thesmoke, and increase the heat. The area of the steam-discharge apertureis one-tenth ofan inch, and of theair-pipc about the same is one andone-fourth of an inch. The steam -j et in the smoke-stack keeps up adraft, so as to keep the fire or heat from pulling out behind, which itsometimes does when the draft is clogged and the air-injectors are atwork.

The discharge-tip is made of what is known as steam metal and alloy orcompound, and which is manufactured and sold in Chicago and elsewhere.

I claim-- 1. A steanrnozzle for an air-injector, provided with a tiphaving an interior shoulder, in combination with a T continuoustherewith.

2. An air'globe for an air-injector,provided with a sound deadeningcushion about the mouth of the air-supply pipe.

3. An air-globe provided with an air-pipe and a sound deadening cushionabout the mouth thereof, in combination with a steamnozzle whichdischarges through the air-pipe.

4. An air-globe having side apertures, an airpipe, and a sound-deadeningcushion about the mouth of the latter, in combination with a nozzlewhich is screw-threaded into one end of such globe and passes throughthe same and discharges into the air-pipe.

5. The combination,with a steam boiler and furnace, of a steam -pipeleading from the stean1-doine,aseries of air-injectors at the front andrear of the furnace,discharging above and below the grate-bars, and asteam-jet toward the forw ard part of the boiler and immediately belowthe smoke-stack, all of the said air and steam injectors being suppliedwith a constant current of steam from the said steam-pipe for thepurpose of supplying the air to the fire, causing the hot gases to beburned before they leave the furnace, and preserving a constant draftthrough the smokestack.

In testimony whereof I have hereunto set my hand, in the presence of twowitnesses, at Chicago. Illinois, this 10th day of November, A. D. 1886.

WILLIAM S. HUTGHINSON.

Vitnesses:

FRANCIS W. PARKER, G. G. JACKSON.

